I am currently running 180/160 HS1 rotors, with an IS adapter at the front, and a PM adapter at the back. How much will I save going to 160/140 (including the lighter IS adapter, and ditching the rear PM adapter)?

Depends on your riding and brakes.... I run 160/160 which are more than adequate for me at 85Kg ready to ride.

What brakes? I have Shimano (M765 ish - one lever and caliper are saint M800 which are the same with different paint) so put an IS caliper (M965) on the rear which was a saving of 43g when comparing the 2 bolts I was using to an adaptor and extra pair of bolts although the caliper is slightly heavier with it's arms.

I have the new xo trail brakes and switched to 160/140 because the brakes were to strong. I went with Hope lightweight rotors and I really love the set up now. I can still lock he read wheel up with ease but I feel I have more control with the 140.

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